PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 28722183-2 2017 Although polyproline or polyglycine type II helices (PPII or PGII ) are frequently found in proteins, they are not considered as equivalent secondary structure elements because they do not form a similar self-contained hydrogen-bonding network of the main chain atoms. polyglycine 24-35 decorin Homo sapiens 61-65 24991291-3 2014 The driving force of the supramer formation is hydrogen bonding, the polypeptide chain conformation is related to the folding of helical polyglycine II (PG II). polyglycine 137-151 decorin Homo sapiens 153-158